API Penetration Testing

Security at the point of trust

API Penetration Testing evaluates the security of APIs used by web applications, mobile applications, and internal services.

Aligned with OWASP API Top 10|Logic & Auth focused|Validated exploitation

Service description

What API Penetration Testing covers

A comprehensive evaluation of your API surface, from authentication to business logic.

API Penetration Testing evaluates the security of APIs used by web applications, mobile applications, and internal services. APIs are a common attack target due to broken authorization models, excessive trust between services, and insufficient validation of user context, often leading to large-scale data exposure or privilege escalation.

The service is aligned with the OWASP API Security Top 10, which reflects the most common causes of real-world API breaches. Testing focuses on object-level and function-level authorization, token lifecycle management, and abuse of business workflows through chained API calls.

In addition to authorization and logic testing, the assessment includes comprehensive input validation and injection testing to identify how improper handling of user-supplied data can be leveraged to manipulate backend queries or application behavior.

Flowchart

Our API penetration testing process

A single, end-to-end view of how an engagement runs from discovery through remediation support.

Engagement stages

A systematic approach to identifying vulnerabilities across your API ecosystem.

Step 01

API Endpoint Discovery

Identify all visible and hidden API endpoints, versions, and documentation across environments.

Step 02

Authentication & Token Lifecycle Analysis

Evaluate authentication mechanisms, token strength, rotation, expiration, and secure handling across clients.

Step 03

Input Handling, Injection & File Processing Testing

Test how the API validates and processes untrusted data, file uploads, and complex payloads to uncover injection and parsing flaws.

Step 04

Object-Level Authorization Testing (BOLA)

Verify whether users can access or manipulate records belonging to other users via ID manipulation or path tampering.

Step 05

Function-Level Authorization Testing (BFLA)

Check for privilege escalation into administrative or restricted API functions through missing or weak authorization controls.

Step 06

Request Chaining & Workflow Abuse

Chain multiple API calls and state transitions to bypass business rules and achieve unintended outcomes.

Step 07

Rate Limiting & Resource Abuse Testing

Test resistance to brute force, denial of service, and resource exhaustion by simulating abusive traffic patterns.

Step 08

Reporting & Remediation Guidance

Provide clear, actionable reports with reproduction steps, risk ratings, and detailed remediation guidance for your teams.

Deliverables

What you take away

Actionable results for developers and security leadership.

Detailed vulnerability report with severity rankingComprehensive documentation of all identified API issues, categorized by risk and impact.

Exploitable abuse scenarios with impact explanationReal-world attack paths including BOLA/BFLA and workflow abuse chains.

Secure API authorization and design recommendationsGuidance on hardening object- and function-level authorization and token handling.

Optional technical walkthrough with engineering teamsQ&A session to ensure developers clearly understand findings and remediation steps.

Executive-ready summary deckSlide-ready summary of key API risks, affected systems, and recommended roadmap.

Retesting window for critical fixesOptional verification window to confirm that high-impact vulnerabilities are properly resolved.

Ready to secure your APIs?

Every engagement includes a formal report and optional live readout call.